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This is a rebuild of Drinking Water Watch and not yet the official record. Use the agency’s current Drinking Water Watch for anything you need to rely on.

Chemical and radiological sample results

MS0440003 , Columbus Light & Water

22 of the 59 analytes this system has been tested for have been detected at least once, across 487 samples on record.

The other 37 were tested for and never found. An analyte is counted here if any result on record measured it, so this covers the whole history and not the samples listed below.

Across all 487 samples on record, detections range from July 16, 2002 to June 22, 2026. These figures cover the whole record; the list of samples further down is narrowed.

What counts as a non-detect is defined in the help: Less than Indicator. This system’s violations.

What has been detected, ever

Every analyte measured above its reporting level at any point in this system’s record, most often detected first. This is not limited to the samples listed below.

Every analyte ever detected for Columbus Light & Water, with how many results found it and when it was first and last detected. Covers the whole record, not only the samples listed below.
Analyte Kind Detected in First detected Last detected
Copper, Free 1022 Inorganic Chemical 250 of 250 results Jun 17, 2004 Jun 27, 2024
Lead 1030 Inorganic Chemical 40 of 250 results Jun 17, 2004 Jun 27, 2024
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 34 of 53 results Mar 21, 2006 Apr 21, 2025
TTHM 2950 Organic Chemical 33 of 53 results Mar 8, 2004 Jun 22, 2026
Chloroform 2941 Organic Chemical 21 of 35 results Aug 1, 2006 Jun 22, 2026
Barium 1010 Inorganic Chemical 18 of 18 results Jul 16, 2002 Mar 10, 2025
Fluoride 1025 Inorganic Chemical 18 of 18 results Jul 16, 2002 Mar 10, 2025
Nickel 1036 Inorganic Chemical 10 of 18 results Jul 16, 2002 Mar 10, 2025
Monochloroacetic Acid 2450 Organic Chemical 10 of 32 results Nov 11, 2013 Jun 12, 2018
Dichloroacetic Acid 2451 Organic Chemical 10 of 32 results Aug 24, 2009 Jun 27, 2016
Bromodichloromethane 2943 Organic Chemical 9 of 35 results Aug 1, 2006 Jun 22, 2026
Monobromoacetic Acid 2453 Organic Chemical 5 of 32 results Aug 17, 2010 Jun 12, 2018
Sodium 1052 Inorganic Chemical 4 of 4 results Mar 2, 2022 Feb 10, 2025
Radium-226 4020 Radionuclide 4 of 8 results May 30, 2018 Sep 3, 2019
Chromium 1020 Inorganic Chemical 4 of 18 results Jul 16, 2002 Jul 9, 2012
Sulfate 1055 Inorganic Chemical 4 of 4 results Jul 16, 2002 Mar 10, 2004
Gross Alpha, Incl. Radon & U 4002 Radionuclide 2 of 4 results May 30, 2018 Sep 3, 2019
Combined Radium (-226 & -228) 4010 Radionuclide 2 of 8 results May 30, 2018 Sep 3, 2019
Radium-228 4030 Radionuclide 2 of 8 results May 30, 2018 Sep 3, 2019
Dibromochloromethane 2944 Organic Chemical 1 of 35 results Jun 22, 2026 Jun 22, 2026
Selenium 1045 Inorganic Chemical 1 of 18 results Mar 10, 2004 Mar 10, 2004
Benzene 2990 Organic Chemical 1 of 28 results Sep 18, 2002 Sep 18, 2002

Showing samples collected between September 25, 2024 and September 25, 2026. That is this page’s default, not a limit on what the agency records.

Show every sample on record

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The most recent samples, result by result

The table below lists 1–10 of 14 samples, newest first — collected March 10, 2025 to June 22, 2026. The summary above covers all 14.

50 results from the 10 samples listed here: 12 detected, 38 not detected. Across the whole record it is 483 of 1,899. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

We withheld the location of 2 sampling points below. The location on record identifies a private home, and we do not publish those. That is our decision, not the agency’s. The sampling point, its type and every result taken there are published unchanged.

Chemical and radiological sample results for Columbus Light & Water, every result from 1 to 10 of 14 samples shown, newest first. Not detected means the amount was below the level the laboratory can reliably report, which is given beside it.
Result Analyte Monitoring period
Collected
Jun 22, 2026 12:21
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
810-197049-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Jun 22, 2026 12:21, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 22, 2026 12:21, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 22, 2026 12:21, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 22, 2026 12:21, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 22, 2026 12:21, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Jun 22, 2026 12:21, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2026 – Dec 31, 2026
1.3 ug/l , sample collected Jun 22, 2026 12:21, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 22, 2026 12:21, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
0.9 ug/l , sample collected Jun 22, 2026 12:21, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
0.61 ug/l , sample collected Jun 22, 2026 12:21, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
2.81 ug/l , sample collected Jun 22, 2026 12:21, sampling point SM1 TTHM 2950 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Collected
Feb 12, 2026 12:44
Sampling point
SM4 Location withheld
Sample type
Routine
Lab sample
810-180882-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Feb 12, 2026 12:44, sampling point SM4 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 12, 2026 12:44, sampling point SM4 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 12, 2026 12:44, sampling point SM4 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 12, 2026 12:44, sampling point SM4 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 12, 2026 12:44, sampling point SM4 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Feb 12, 2026 12:44, sampling point SM4 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2026 12:44, sampling point SM4 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2026 12:44, sampling point SM4 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2026 12:44, sampling point SM4 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2026 12:44, sampling point SM4 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2026 12:44, sampling point SM4 TTHM 2950 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Collected
Sep 29, 2025 13:13
Sampling point
TF081 Treatment Plant T081
Sample type
Routine
Lab sample
CN-250930-030
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Sep 29, 2025 13:13, sampling point TF081 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Sep 8, 2025 14:28
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
CN-250909-019
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Sep 8, 2025 14:28, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Apr 21, 2025 13:58
Sampling point
SM4 Location withheld
Sample type
Routine
Lab sample
TH-250422-004
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Apr 21, 2025 13:58, sampling point SM4 TTHM 2950 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Collected
Apr 21, 2025 14:24
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
TH-250422-003
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Apr 21, 2025 14:24, sampling point SM1 TTHM 2950 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Collected
Apr 21, 2025 14:00
Sampling point
SM4 Location withheld
Sample type
Routine
Lab sample
HA-250422-006
Laboratory
MSDH Lab
5.2 ug/l , sample collected Apr 21, 2025 14:00, sampling point SM4 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2025 – Dec 31, 2025
Collected
Apr 21, 2025 14:20
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
HA-250422-005
Laboratory
MSDH Lab
5.71 ug/l , sample collected Apr 21, 2025 14:20, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2025 – Dec 31, 2025
Collected
Mar 10, 2025 13:50
Sampling point
TF081 Treatment Plant T081
Sample type
Routine
Lab sample
IN-250311-050
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 13:50, sampling point TF081 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0193 mg/l , sample collected Mar 10, 2025 13:50, sampling point TF081 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 13:50, sampling point TF081 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 13:50, sampling point TF081 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.589 mg/l , sample collected Mar 10, 2025 13:50, sampling point TF081 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 13:50, sampling point TF081 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0006 mg/l , sample collected Mar 10, 2025 13:50, sampling point TF081 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 13:50, sampling point TF081 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 13:50, sampling point TF081 Antimony, Total 1074 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 13:50, sampling point TF081 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 13:50, sampling point TF081 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Mar 10, 2025 12:57
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
IN-250311-049
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 12:57, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0079 mg/l , sample collected Mar 10, 2025 12:57, sampling point TF080 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 12:57, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 12:57, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.676 mg/l , sample collected Mar 10, 2025 12:57, sampling point TF080 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 12:57, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0008 mg/l , sample collected Mar 10, 2025 12:57, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 12:57, sampling point TF080 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 12:57, sampling point TF080 Antimony, Total 1074 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 12:57, sampling point TF080 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 10, 2025 12:57, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025

Routine (10).